Grinding and sharpening machine.



Patented Nov. I4, |899.

' T. PATTN.

GHINDING AND SHARPENING MACHINE.

(Application led June 29, 1899.

2 Sheets-Sheet l.

Tn: Nonms Pinzas co. Hora-mwa. wAswNs'rcN. u4 c.

10.637.022 Patented Nov. 14, |899.

T. PATToN.

GRINDING AND SHARPENING MACHINE.-

(Application led June 29,*1899.) (No Model.) 2 sheets-sheet 2.

. me Nouns Pneus I THOMAS PATTON, OF GREENSBURG,

PATENT OFFICE.V

PENNSYLVANIA, ASSIGNORl OF ONE- FOURTH TO JAMES A. BENNETT, OF SAME PLACE.

GRVINDING AND SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 637,022, dated November 14, 1899.

Application filed J' une 2 9 1 8 9 9 To all whom t may concern.-

Beit known that I, THOMAS PATToN, a citizen of the United States, residing at Greensburg, in the count-y of Westmoreland and State of Pennsylvania, have invented new and useful Improvements in Grinding and Sharpening Machines, of which the following is a specification.

This invention relates to an improved machine for grinding and sharpening mowing-V machine knives, and has for its object to provide the knife-bar support or carrier with all adjustments necessary for accurately presenting the knife-edges to the grinding-stone.

A further object is to provide a holder which will receive and effectually secure all forms of knife-bars, including those whereon the back ends of the knife-sections project beyond or over the longitudinal edge of the bar.

A further object is to provide an improved support for the extended end of the knife-bar.

The invention consists in the novel structural features and combination and arrangement of parts hereinafter fully described and claimed, and illustrated by the accompanying drawings, in which- Figure 1 is an end elevation of the machine. Fig. 2 is a side elevation. Fig. 3 is a plan view. Fig. 1 is a vertical longitudinal sectional view. Fig. 5 is a plan view showing position of knife-sections when being ground. Figs. 6 and 7 are detail views of the knifebar carrier or rack. Fig. 8 is a detail view of the extended support.

A designates a stand or base, and fixed thereto is standard B, rotatably supporting drive-gear O. Arm B of standard B rotatably supports grinding-stone D, suitable intermediate gearing connecting the stone and wheel C. The face of the stone is inclined from a perpendicular, as shown.

Supported by stand A in horizontal parallel position are rods X, supporting plate E, the latter being slidable thereon toward and away from the stone through the medium of bearings e, which permanently hold the plate transversely in proper'position. The forward edge of the plate is cut out to embrace the stone, and its side edges are formed with the iiat 5o curved ways E. The forward portion of the plate is formed with a central depressed boss Serial No. 722,269. (No model.)

F, apertured vertically, with the upper end of the aperture enlarged to receive'lugs g, depending centrally from bar or bracket G, which has horizontal position on plate E. Bolt H is pivoted between lugs g and depends through boss F and at its lower end carries a nut, with spring I-I on the bolt between the nut and boss. The tension of this spring holds bar G normally flat or in horizontal po- 6o sition on plate E, and forward tilting of the bar, as when bringing a knife-section to position against the stone, is resisted by the spring, which immediately returns it to horizontal position, when the hold is relaxed. Bar G oscillates on Ways E', bolt H constituting the pivot, when assuming proper position and angle relative to the stone. v

Knife-bar I rests on the longitudinal edge of bar or bracket G, being held in position at 7o the front by brackets .I at either end of bar or bracket G, while clamp K firmly secures it centrally 011 the rear side, said clamp being carried by boss L of bar G and actuated by thumb-screw L. Brackets J are depressed 7 5 at J to freely pass the heads of rivets which secure the knife-sections I to bar I, and it will be noted that the bases of said brackets stand away from bar I to form space M to accommodate the back ends of any knife-sec- 8o tions I which may project beyond bar I, so that whether the knife-sections are flush with the back of bar I or project therefrom the bar will always lie flatly on bar or bracket G.

For supporting the extended end of knifebar I a laterally-projecting arm N is provided, having a cone-bearing O in a complementary socket P, secured to stand A, and at its outer end carrying the horizontally-pivoted block O', notched on its upper side to 9o receive the bar. Block O turns freely to accommodate itself to the angle of the knifebar, while arm O has similar movement in the cone-socket. This tapering connection insures a constantly tight or accurate bearing. A socket P is provided at either side of the stand, and the arm O may be moved from one side to the other, according to the projection of the knife-bar.

In operation the knife-bar is secured to roo bar or bracket G in the manner described and plate E is moved on rods X, either forward or backward, to such position as will bring the whole length of the knife-section bevel in contact with the face of the stone, when bar or bracket G is rocked forward, and in such position the plate is held by screw Q binding on one of rods X. The proper lateral deiiection of the bar or bracket G is then ascertained by oscillating it on plate E, and one of adjustable stops R on the forward ends of ways E is then set to properly limit the oscillating movement. By means of these adjustments the knife-bevel may be made to bear iiatly on the face of the stone, both longitudinally and transversely, and the same adjustment answers for the corresponding bevels of all the other knife-sections. For grinding the opposite bevels of the knife-sections the longitudinal position of plate E on rods X remains the same, bar Gbeing simply oscillated reversely and the other stop R set to limit its movement. In the case of a bent knife-section the adjusting means maybe so manipulated, dependent on the shape the knife has taken, as to bring the whole length of its bevel against the face of the stone. As before stated, arm O may be changed from side to side, according to the projection of the knife-bar.

The stone-support has fixed position, and all of the adjustments necessary are accomplished by manipulating the knife-bar support, and all being within easy reach of the operator it is unnecessary for him to leave his seat 011 the stand.

If desired, the entire support, together with rods X, may be removed from the stand, leaving only the stone and actuating-gearing for general grinding and sharpening use.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a knife griudingand sharpening machine, the 'combination of a horizontally-oscillating knife-bar support, a laterally-extending arm pivoted to turn horizontally, and a block at the outer end of the arm pivoted to turn horizontally, substantially as shown and described.

2. In an improved grinding and sharpening machine, the combination of a base or bench, a rotatable grinding-stone having fixed position on the base, guide-rods secured to the base in parallel position in front of the stone, plate E slidable on said rods toward and away from the stone, the top edges of the plate being attened to form trackways E', bar Greentrally pivoted on plate E to oscillate horizontally on ways E', bar G also being centrally pivoted to oscillate vertically toward and away-from the stone, a spring for holding the said bar normally away from the stone, and knife-bar holding and securin g means carried by bar G, substantially as shown and described.

3. In an improved grinding and sharpening machine, the combination of a base or bench, a rotatable grinding-stone having fixed position on the base, a knife-bar carrier supported by the base and movable horizontally to= ward and away from the stone, said holder being adapted also to oscillate horizontally and vertically, whereby it can assume all positions necessary for accurately presenting the knives to the stone, bearings on the base at opposite sides of the carrier, and a laterally-projecting arm interchangeably adapted at its inner end to said bearings in which it has horizontal tnrnin g movement, the arm being adapted to support the projecting end of the knife-bar and move in accord with the said carrier, substantially as shown and described.

4. In an improved grinding and sharpening machine, the combination of a base or bench, a grinding-stone, a knife-barsupport adjustable on the base to accurately present the knife-sections to the stone, bearings on the base at opposite sides of the carrier, and a laterally-projecting arm at its inner end interchangeably adapted to said bearings and having horizontal turnin g movement, the projecting support being adapted to positively hold the projecting extremity of the knife-bar and at the same time conform to any movement of the carrier, substantially as shwn and described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS PATION.

IVitnesses:

RICHARD ALooRN, SAML. A. CLEMENTS. 

